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Posted by **Christina** on Wednesday, July 25, 2012 at 9:57am.

7z^2+21z-az-3a

- algebra -
**Jai**, Wednesday, July 25, 2012 at 10:42am7z^2 + 21z - az - 3a

7z(z + 3) - a(z + 3)

(7z - a)(z + 3)

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